Image anti-aliasing method and image anti-aliasing device

An image anti-aliasing device, comprising:

• a storage device;
• and
• a processing device, coupled to the storage device, wherein the processing device receives an aliasing image, generates a plurality of hash values corresponding to a plurality of source pixels respectively, and performs a filtering processing or a filter generating procedure on the aliasing image according to the plurality of hash values, wherein the aliasing image includes the plurality of source pixels;
• wherein each of the plurality of hash values is generated by the following steps:
• selecting one source pixel from the aliasing image and selecting a window containing the selected source pixel;
• determining an aliasing strength according to grayscale values of all the source pixels of a row and a column at which the selected source pixel is located in the window;
• and
• determining a hash value of the selected source pixel according to the aliasing strength.